diff --git a/.travis.yml b/.travis.yml
index 68254a1e..305b96aa 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,13 +4,10 @@ branches:
   - gh-pages
 sudo: false
 before_script:
-  - npm install web-component-tester
   - npm install bower
   - npm install -g gulp
   - export PATH=$PWD/node_modules/.bin:$PATH
   - bower install
-  - gulp patch-browserjs
-  - gulp patch-web-component-tester
 env:
   global:
     - secure: "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"
@@ -20,7 +17,4 @@ addons:
   sauce_connect: true
 script:
   - xvfb-run wct test/index2.html
-  - #cp -vf test/min-wct.conf.json wct.conf.json
-  - #cp -vf bower_components/test-fixture/test-fixture-es5.html bower_components/test-fixture/test-fixture.html
-  - #xvfb-run wct test/index2-min.html
-  - if [ "${TRAVIS_BRANCH}" != "" ]; then lcov-result-merger 'test/coverage-report*/lcov.info' | ./node_modules/coveralls/bin/coveralls.js; fi
+  - if [ "${TRAVIS_BRANCH}" != "" ]; then lcov-result-merger 'test/coverage-report*/lcov.info' | ./node_modules/coveralls/bin/coveralls.js || echo success; fi
diff --git a/bower.json b/bower.json
index d368eb70..9e697a03 100755
--- a/bower.json
+++ b/bower.json
@@ -36,7 +36,7 @@
     "i18n-number": "#2.0-develop"
   },
   "devDependencies": {
-    "web-component-tester": "^5.0.0",
+    "web-component-tester": "t2ym/web-component-tester#istanbul",
     "es6-shim": "^0.35.1",
     "get-own-property-symbols": "es-shims/get-own-property-symbols#^0.9.2",
     "iron-component-page": "PolymerElements/iron-component-page#2.0-preview",
diff --git a/package.json b/package.json
index c81da982..6919b9b9 100644
--- a/package.json
+++ b/package.json
@@ -64,8 +64,8 @@
     "run-sequence": "^1.1.5",
     "strip-bom": "^3.0.0",
     "through2": "^2.0.1",
-    "web-component-tester": "^5.0.0",
-    "web-component-tester-istanbul": "https://github.com/t2ym/web-component-tester-istanbul/tarball/0.10.1",
+    "web-component-tester": "https://github.com/t2ym/web-component-tester#istanbul",
+    "web-component-tester-istanbul": "https://github.com/t2ym/web-component-tester-istanbul#0.10.1-wct6.6",
     "xliff-conv": "^1.0.10"
   }
 }